Keywords: public domain inspiration elusive muse collage fodder drawing reference Public Domain Book: Astronomicum cæsareum by Apian, Peter, 1495-1552 Published 1540 archive.org/details/astronomicumcsar00apia Public Domain Book: Astronomicum cæsareum by Apian, Peter, 1495-1552 Published 1540 archive.org/details/astronomicumcsar00apia |